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<head><meta charset="utf-8"><title>weekly meeting 2020-03-26 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html">weekly meeting 2020-03-26 #54818</a></h3>

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<a name="191787991"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191787991" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191787991">(Mar 25 2020 at 18:03)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> ; the triage meeting will be starting in 20hs</p>



<a name="191788184"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191788184" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191788184">(Mar 25 2020 at 18:05)</a>:</h4>
<p>The <span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> will be doing pre-triage in <a class="stream-topic" data-stream-id="227806" href="/#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/pre-meeting.20triage.202020-03-26">#t-compiler/wg-prioritization &gt; pre-meeting triage 2020-03-26</a></p>



<a name="191788452"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191788452" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191788452">(Mar 25 2020 at 18:07)</a>:</h4>
<p>this week we will have check-ins from <span class="user-group-mention" data-user-group-id="1380">@WG-learning</span> and <span class="user-group-mention" data-user-group-id="1176">@WG-llvm</span></p>



<a name="191788502"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191788502" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191788502">(Mar 25 2020 at 18:07)</a>:</h4>
<p><span class="user-mention" data-user-id="198054">@mark-i-m</span> can you provide a learning wg update? if you can't I'll do it :)</p>



<a name="191788574"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191788574" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191788574">(Mar 25 2020 at 18:08)</a>:</h4>
<p><span class="user-mention" data-user-id="123586">@nagisa</span> is there something to share about WG-LLVM?</p>



<a name="191808156"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191808156" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191808156">(Mar 25 2020 at 20:40)</a>:</h4>
<p>I will leave the <a href="https://hackmd.io/87lxD7SMTyibmFDtOFET0Q?view" title="https://hackmd.io/87lxD7SMTyibmFDtOFET0Q?view">meeting agenda here</a></p>



<a name="191840325"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191840325" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mark-i-m <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191840325">(Mar 26 2020 at 04:54)</a>:</h4>
<p><span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> I can do it :)</p>



<a name="191886943"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191886943" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191886943">(Mar 26 2020 at 13:51)</a>:</h4>
<p>hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>, triage meeting will be starting in 9 minutes</p>



<a name="191888476"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888476" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888476">(Mar 26 2020 at 14:01)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>! Add a <span aria-label="wave" class="emoji emoji-1f44b" role="img" title="wave">:wave:</span> emoji to show you're here :)</p>



<a name="191888585"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888585" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888585">(Mar 26 2020 at 14:02)</a>:</h4>
<p>We'll open with five minutes for ...</p>



<a name="191888591"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888591" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888591">(Mar 26 2020 at 14:02)</a>:</h4>
<h2>Announcements</h2>



<a name="191888635"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888635" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888635">(Mar 26 2020 at 14:02)</a>:</h4>
<p>(<a href="https://hackmd.io/87lxD7SMTyibmFDtOFET0Q?view" title="https://hackmd.io/87lxD7SMTyibmFDtOFET0Q?view">agenda is here</a>)</p>



<a name="191888658"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888658" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888658">(Mar 26 2020 at 14:03)</a>:</h4>
<ul>
<li>As per last week discussion, we are going to stop tagging as I-nominated on toolstate breakage <a href="https://github.com/rust-lang/rust/issues/70407" title="https://github.com/rust-lang/rust/issues/70407">#70407</a></li>
</ul>



<a name="191888843"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888843" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888843">(Mar 26 2020 at 14:04)</a>:</h4>
<p>(there is some back and forth comments on the issue itself regarding whether the regular check of toolstate should be duty of T-release or T-compiler ... you can look over there and even chime in if you have something new to add to the discussion.)</p>



<a name="191888930"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888930" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888930">(Mar 26 2020 at 14:05)</a>:</h4>
<p>just in case, I'm going to add that to T-compiler prioritization procedure</p>



<a name="191888954"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191888954" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191888954">(Mar 26 2020 at 14:05)</a>:</h4>
<p>but the summary is: for now it will remain our (T-compiler's) job; its just a question of how/when we look at toolstate breakage. Hopefully this new process will be more efficient than what we were doing before.</p>



<a name="191889084"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889084" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889084">(Mar 26 2020 at 14:06)</a>:</h4>
<ul>
<li>We have no steering meeting tomorrow; as discussed ... two weeks ago? ... we are continuing to figure out our overall schedule in the face of the world-wide COVID-19 epidemic</li>
</ul>



<a name="191889192"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889192" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889192">(Mar 26 2020 at 14:07)</a>:</h4>
<p>(I do hope that everyone is staying safe and maintaining their state of health in the face of all of this!!!)</p>



<a name="191889391"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889391" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889391">(Mar 26 2020 at 14:09)</a>:</h4>
<p>Okay, so, going through the <a href="https://hackmd.io/87lxD7SMTyibmFDtOFET0Q?view" title="https://hackmd.io/87lxD7SMTyibmFDtOFET0Q?view">agenda</a></p>



<a name="191889414"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889414" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889414">(Mar 26 2020 at 14:09)</a>:</h4>
<p>Next up we have four beta-nominations</p>



<a name="191889442"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889442" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889442">(Mar 26 2020 at 14:09)</a>:</h4>
<p>beta-nom 1/4: “Fix smaller issues with invalid placeholder type errors” <a href="https://github.com/rust-lang/rust/issues/70369" title="https://github.com/rust-lang/rust/issues/70369">#70369</a></p>



<a name="191889633"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889633" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889633">(Mar 26 2020 at 14:10)</a>:</h4>
<p>Not sure why this should be backported; it doesn't fix an ICE or anything</p>



<a name="191889643"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889643" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889643">(Mar 26 2020 at 14:10)</a>:</h4>
<p><span class="user-mention" data-user-id="119031">@Esteban Küber</span> was there a specific bug this was fixing?</p>



<a name="191889681"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889681" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889681">(Mar 26 2020 at 14:11)</a>:</h4>
<p>ah <a href="https://github.com/rust-lang/rust/pull/70369#issuecomment-603585962" title="https://github.com/rust-lang/rust/pull/70369#issuecomment-603585962">here</a> is <span class="user-mention" data-user-id="119031">@Esteban Küber</span> 's comment on the matter:</p>
<blockquote>
<p>Nominating for backport (but with much lower priority) as I feel this goes in tandem with <a href="https://github.com/rust-lang/rust/issues/70294" title="https://github.com/rust-lang/rust/issues/70294">#70294</a>.</p>
</blockquote>



<a name="191889743"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889743" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889743">(Mar 26 2020 at 14:11)</a>:</h4>
<p>but yeah, without a specific reason, this is a <span aria-label="shrug" class="emoji emoji-1f937" role="img" title="shrug">:shrug:</span> at best for me.</p>



<a name="191889910"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889910" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889910">(Mar 26 2020 at 14:12)</a>:</h4>
<p><span class="user-mention" data-user-id="126931">@centril</span> am I right that, in essence, this PR is the follow-up de-dup you <a href="https://github.com/rust-lang/rust/pull/70294#issuecomment-602810132" title="https://github.com/rust-lang/rust/pull/70294#issuecomment-602810132">referenced here</a> ?</p>



<a name="191889942"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889942" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889942">(Mar 26 2020 at 14:12)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> I think so</p>



<a name="191889996"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191889996" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191889996">(Mar 26 2020 at 14:13)</a>:</h4>
<p>(in which case, I'd say the plan of record was indeed to focus on back-porting just the <a href="https://github.com/rust-lang/rust/issues/70294" title="https://github.com/rust-lang/rust/issues/70294">#70294</a></p>



<a name="191890001"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890001" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890001">(Mar 26 2020 at 14:13)</a>:</h4>
<p>I would personally elect to backport <a href="https://github.com/rust-lang/rust/issues/70294" title="https://github.com/rust-lang/rust/issues/70294">#70294</a> but not the follow-up</p>



<a name="191890025"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890025" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890025">(Mar 26 2020 at 14:13)</a>:</h4>
<p>yeah, in hindsight these probably should have been listed so that <a href="https://github.com/rust-lang/rust/issues/70294" title="https://github.com/rust-lang/rust/issues/70294">#70294</a> came first</p>



<a name="191890121"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890121" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890121">(Mar 26 2020 at 14:14)</a>:</h4>
<p>okay, well I'm going to work with the assumption that we are declining to backport <a href="https://github.com/rust-lang/rust/issues/70369" title="https://github.com/rust-lang/rust/issues/70369">#70369</a></p>



<a name="191890146"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890146" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890146">(Mar 26 2020 at 14:14)</a>:</h4>
<p>beta-nom 2/4: “Account for bad placeholder types in where clauses” <a href="https://github.com/rust-lang/rust/issues/70294" title="https://github.com/rust-lang/rust/issues/70294">#70294</a></p>



<a name="191890206"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890206" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890206">(Mar 26 2020 at 14:14)</a>:</h4>
<p>(This one does fix an ICE)</p>



<a name="191890267"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890267" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890267">(Mar 26 2020 at 14:15)</a>:</h4>
<p>/me is loving how each one of these descriptions is saying "follow-up to PR xxx"</p>



<a name="191890280"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890280" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890280">(Mar 26 2020 at 14:15)</a>:</h4>
<p>(its like I'm traversing a linked list!)</p>



<a name="191890422"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890422" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890422">(Mar 26 2020 at 14:16)</a>:</h4>
<p>okay this looks like an easy beta-accept</p>



<a name="191890455"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890455" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890455">(Mar 26 2020 at 14:16)</a>:</h4>
<p>so, just for the record:</p>



<a name="191890468"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890468" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890468">(Mar 26 2020 at 14:17)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/70369" title="https://github.com/rust-lang/rust/issues/70369">#70369</a> declined for beta-backport</p>



<a name="191890480"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890480" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890480">(Mar 26 2020 at 14:17)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/70294" title="https://github.com/rust-lang/rust/issues/70294">#70294</a> beta-accepted</p>



<a name="191890509"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890509" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890509">(Mar 26 2020 at 14:17)</a>:</h4>
<p>beta-nom 3/4: “Fix ICE caused by truncating a negative ZST enum discriminant” <a href="https://github.com/rust-lang/rust/issues/70126" title="https://github.com/rust-lang/rust/issues/70126">#70126</a></p>



<a name="191890733"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890733" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890733">(Mar 26 2020 at 14:18)</a>:</h4>
<p>Well <a href="https://github.com/rust-lang/rust/issues/70126" title="https://github.com/rust-lang/rust/issues/70126">#70126</a> feels more risky, but on the other hand, stable-stable regression</p>



<a name="191890812"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890812" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890812">(Mar 26 2020 at 14:19)</a>:</h4>
<p>wait, "on the other hand" i usually take to mean "this second point overrides the first"</p>



<a name="191890838"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890838" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890838">(Mar 26 2020 at 14:20)</a>:</h4>
<p>This is my PR so I'm happy to answer questions if there are any.</p>



<a name="191890847"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890847" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890847">(Mar 26 2020 at 14:20)</a>:</h4>
<p>but often fixes to stable-to-stable regressions are things we can afford to let ride the trains</p>



<a name="191890901"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890901" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890901">(Mar 26 2020 at 14:20)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> I think I'm going with "reluctantly beta-accepted" <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="191890925"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890925" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890925">(Mar 26 2020 at 14:20)</a>:</h4>
<p>I nominated because it's a stable-to-stable regression but I don't personally think this is super critical.</p>



<a name="191890949"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890949" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890949">(Mar 26 2020 at 14:20)</a>:</h4>
<p>/me goes to see when this was injected</p>



<a name="191890969"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191890969" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191890969">(Mar 26 2020 at 14:20)</a>:</h4>
<p>Rust 1.40</p>



<a name="191891015"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891015" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891015">(Mar 26 2020 at 14:21)</a>:</h4>
<p>My inclination is that we can let this ride the trains</p>



<a name="191891045"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891045" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891045">(Mar 26 2020 at 14:21)</a>:</h4>
<p>I think I agree</p>



<a name="191891057"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891057" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891057">(Mar 26 2020 at 14:21)</a>:</h4>
<p>if it were injected in a more recent release, then I'd be more conflicted</p>



<a name="191891098"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891098" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891098">(Mar 26 2020 at 14:21)</a>:</h4>
<p>but the fact that this had laid fallow for this long, I take as a sign that its not a critical bug to justify a backport</p>



<a name="191891101"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891101" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891101">(Mar 26 2020 at 14:21)</a>:</h4>
<p>Seems reasonable</p>



<a name="191891127"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891127" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891127">(Mar 26 2020 at 14:22)</a>:</h4>
<p>okay</p>



<a name="191891157"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891157" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891157">(Mar 26 2020 at 14:22)</a>:</h4>
<p>The codegen bug has been there even longer IIRC</p>



<a name="191891168"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891168" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891168">(Mar 26 2020 at 14:22)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/70126" title="https://github.com/rust-lang/rust/issues/70126">#70126</a> declined for beta backport</p>



<a name="191891211"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891211" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891211">(Mar 26 2020 at 14:22)</a>:</h4>
<p><span class="user-mention silent" data-user-id="125250">Wesley Wiser</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191891157" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191891157">said</a>:</p>
<blockquote>
<p>The codegen bug has been there even longer IIRC</p>
</blockquote>
<p>which is that referring to? The earlier bugs we approved for backports?</p>



<a name="191891237"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891237" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891237">(Mar 26 2020 at 14:22)</a>:</h4>
<p>or the one coming up?</p>



<a name="191891241"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891241" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891241">(Mar 26 2020 at 14:23)</a>:</h4>
<p>Sorry, there's two fixes in PR <a href="https://github.com/rust-lang/rust/issues/70126" title="https://github.com/rust-lang/rust/issues/70126">#70126</a></p>



<a name="191891262"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891262" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891262">(Mar 26 2020 at 14:23)</a>:</h4>
<p>ah right</p>



<a name="191891306"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891306" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891306">(Mar 26 2020 at 14:23)</a>:</h4>
<p>I did notice that its seemed like there were two only tangentially related changes in there. <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="191891332"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891332" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891332">(Mar 26 2020 at 14:23)</a>:</h4>
<p>I considered asking about it but then decided to let it slide</p>



<a name="191891348"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891348" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891348">(Mar 26 2020 at 14:23)</a>:</h4>
<p>I was just saying the codegen bug fixed in <a href="https://github.com/rust-lang/rust/issues/70126" title="https://github.com/rust-lang/rust/issues/70126">#70126</a> has been there for quite a few releases prior to 1.40 and no one has noticed.</p>



<a name="191891367"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891367" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891367">(Mar 26 2020 at 14:23)</a>:</h4>
<p>gotcha</p>



<a name="191891436"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891436" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891436">(Mar 26 2020 at 14:24)</a>:</h4>
<p>on the other hand, a codegen bug can be harder to notice than an ICE</p>



<a name="191891514"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891514" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891514">(Mar 26 2020 at 14:24)</a>:</h4>
<p>does that shift anyone's opinion here enough to push for a backport? I guess maybe <span class="user-mention" data-user-id="126931">@centril</span> is implicitly saying we should rethink that?</p>



<a name="191891598"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891598" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891598">(Mar 26 2020 at 14:25)</a>:</h4>
<p>I'm comfortable with the overall "let it ride" <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="191891631"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891631" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891631">(Mar 26 2020 at 14:25)</a>:</h4>
<p>okay. lets just let it ride the trains</p>



<a name="191891652"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891652" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891652">(Mar 26 2020 at 14:26)</a>:</h4>
<p>the bug report at least didn't seem to convey particular urgency</p>



<a name="191891704"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891704" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891704">(Mar 26 2020 at 14:26)</a>:</h4>
<p>beta-nom 4/4: “Ensure HAS_FREE_LOCAL_NAMES is set for ReFree” <a href="https://github.com/rust-lang/rust/issues/69956" title="https://github.com/rust-lang/rust/issues/69956">#69956</a></p>



<a name="191891761"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891761" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891761">(Mar 26 2020 at 14:26)</a>:</h4>
<p>I'm not sure what exactly this fixes, but did the original PR make it into beta?</p>



<a name="191891850"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891850" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891850">(Mar 26 2020 at 14:27)</a>:</h4>
<p>That is, I don't think there was any bug report in particular that prompted this fix, right <span class="user-mention" data-user-id="116118">@Matthew Jasper</span>?</p>



<a name="191891903"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891903" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891903">(Mar 26 2020 at 14:27)</a>:</h4>
<p>Feels weird backporting something we don't know what it fixes <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="191891973"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891973" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891973">(Mar 26 2020 at 14:28)</a>:</h4>
<p>the main justification is that we know exactly when it was injected</p>



<a name="191891999"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191891999" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Matthew Jasper <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191891999">(Mar 26 2020 at 14:28)</a>:</h4>
<p>In principle it prevents incorrect use of global selection caches. I couldn't work out hope to use that to cause a bug.</p>



<a name="191892034"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892034" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892034">(Mar 26 2020 at 14:28)</a>:</h4>
<p>(in theory. though without a test, maybe it would have been buggy even before PR <a href="https://github.com/rust-lang/rust/issues/69469" title="https://github.com/rust-lang/rust/issues/69469">#69469</a> )</p>



<a name="191892066"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892066" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892066">(Mar 26 2020 at 14:29)</a>:</h4>
<p><span class="user-mention" data-user-id="116118">@Matthew Jasper</span> so in principle it could prevent a soundness hole?</p>



<a name="191892278"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892278" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892278">(Mar 26 2020 at 14:30)</a>:</h4>
<p>I am again inclined to let this ride the trains</p>



<a name="191892297"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892297" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Matthew Jasper <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892297">(Mar 26 2020 at 14:30)</a>:</h4>
<p>Maybe.</p>



<a name="191892302"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892302" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892302">(Mar 26 2020 at 14:30)</a>:</h4>
<p>but it is really hard to decide here</p>



<a name="191892419"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892419" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892419">(Mar 26 2020 at 14:31)</a>:</h4>
<p>I personally have no idea what the risk assessment here is wrt. correctness of the new impl vs. risk of soundness holes in the old</p>



<a name="191892432"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892432" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892432">(Mar 26 2020 at 14:31)</a>:</h4>
<p>I suppose this is the classic question of how to measure the risk introduced by this PR vs the risk of letting its bug go unfixed ...</p>



<a name="191892588"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892588" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892588">(Mar 26 2020 at 14:32)</a>:</h4>
<p>Maybe let's ask... <span class="user-mention" data-user-id="116009">@nikomatsakis</span> <span class="user-mention" data-user-id="116118">@Matthew Jasper</span>  how confident are y'all in the correctness of the new impl?</p>



<a name="191892618"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892618" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892618">(Mar 26 2020 at 14:32)</a>:</h4>
<p><span class="user-mention" data-user-id="116118">@Matthew Jasper</span> so you just found this by reviewing your code and realizing you had mishandled this case?</p>



<a name="191892643"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892643" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892643">(Mar 26 2020 at 14:32)</a>:</h4>
<p>/me reviews the PR briefly</p>



<a name="191892678"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892678" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Matthew Jasper <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892678">(Mar 26 2020 at 14:32)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span>  Yes.</p>



<a name="191892943"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892943" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892943">(Mar 26 2020 at 14:34)</a>:</h4>
<p>I'm pretty confident that this is correct (although in reviewing it I wonder if it's a bit overly conservative)</p>



<a name="191892978"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191892978" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191892978">(Mar 26 2020 at 14:34)</a>:</h4>
<p>conservative sounds good <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="191893008"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893008" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893008">(Mar 26 2020 at 14:35)</a>:</h4>
<p>i guess I'm willing to go along with a backport, since it followed the original PR by only 10 days or so</p>



<a name="191893055"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893055" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893055">(Mar 26 2020 at 14:35)</a>:</h4>
<p>Yes, I think it's fine to backport</p>



<a name="191893056"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893056" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893056">(Mar 26 2020 at 14:35)</a>:</h4>
<p>so its largely an artifact of the train timing that we're having this conversation</p>



<a name="191893141"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893141" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893141">(Mar 26 2020 at 14:35)</a>:</h4>
<p>time check: 35 minutes in</p>



<a name="191893150"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893150" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893150">(Mar 26 2020 at 14:35)</a>:</h4>
<p>Okay.</p>



<a name="191893159"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893159" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893159">(Mar 26 2020 at 14:35)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/69956" title="https://github.com/rust-lang/rust/issues/69956">#69956</a> beta-accepted</p>



<a name="191893225"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893225" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893225">(Mar 26 2020 at 14:36)</a>:</h4>
<p>that's all the beta-nominations</p>



<a name="191893230"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893230" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893230">(Mar 26 2020 at 14:36)</a>:</h4>
<p>we have no stable nominations</p>



<a name="191893252"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893252" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893252">(Mar 26 2020 at 14:36)</a>:</h4>
<p>we have no PR's marked S-waiting-on-team.</p>



<a name="191893277"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893277" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Matthew Jasper <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893277">(Mar 26 2020 at 14:36)</a>:</h4>
<p>I'm confident that the PR is how the flags are intended to work. I think that any changes here should be to the selection caching code, not the flags.</p>



<a name="191893311"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893311" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893311">(Mar 26 2020 at 14:36)</a>:</h4>
<h2>P-high Issues of Note</h2>
<ul>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+">50 P-high issues</a> (4 less than last week)</li>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+no%3Aassignee" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+no%3Aassignee">30 of those are unassigned</a> (2 less than last week)</li>
<li><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta">3 P-medium regression-from-stable-to-beta</a></li>
<li><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-nightly" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-nightly">1 P-high and 3 P-medium regression-from-stable-to-nightly</a></li>
</ul>



<a name="191893590"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893590" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893590">(Mar 26 2020 at 14:38)</a>:</h4>
<p>For the stable-to-beta P-medium regressions, two are assigned (both to <span class="user-mention" data-user-id="119031">@Esteban Küber</span> )</p>



<a name="191893645"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893645" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893645">(Mar 26 2020 at 14:39)</a>:</h4>
<p>the third, which is unassigned, is "no_mangle causes compilation errors with async-await on armv7-linux-androideabi and aarch64-linux-android targets" <a href="https://github.com/rust-lang/rust/issues/70098" title="https://github.com/rust-lang/rust/issues/70098">#70098</a></p>



<a name="191893664"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893664" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893664">(Mar 26 2020 at 14:39)</a>:</h4>
<p>I'll try to get them done shortly, but I've been swamped lately</p>



<a name="191893665"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893665" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893665">(Mar 26 2020 at 14:39)</a>:</h4>
<p>which does have some active discussion, so that is good</p>



<a name="191893677"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893677" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893677">(Mar 26 2020 at 14:39)</a>:</h4>
<p><span class="user-mention" data-user-id="119031">@Esteban Küber</span> no worries</p>



<a name="191893698"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893698" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893698">(Mar 26 2020 at 14:39)</a>:</h4>
<p>I wasn't trying to call you out, at least in any negative way. <span aria-label="smiley" class="emoji emoji-1f603" role="img" title="smiley">:smiley:</span></p>



<a name="191893805"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893805" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893805">(Mar 26 2020 at 14:40)</a>:</h4>
<p>for the stable-to-nightly regressions, the P-high one is also unassigned. It is: "file not found for module" <a href="https://github.com/rust-lang/rust/issues/70314" title="https://github.com/rust-lang/rust/issues/70314">#70314</a></p>



<a name="191893882"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893882" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893882">(Mar 26 2020 at 14:41)</a>:</h4>
<p>seems like that last one still needs minimization, but did we at least figure out what PR broke it?</p>



<a name="191893895"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893895" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893895">(Mar 26 2020 at 14:41)</a>:</h4>
<p>it looks like the cleanup crew is doing a great job over there trying to work with the bug filer to figure out what a reduced test would look like</p>



<a name="191893966"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191893966" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191893966">(Mar 26 2020 at 14:41)</a>:</h4>
<p>In case <a href="https://github.com/rust-lang/rust/issues/70314" title="https://github.com/rust-lang/rust/issues/70314">#70314</a> was injected by my expansion outline-module PR then I'm waiting for a minimal example to work with</p>



<a name="191894032"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894032" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894032">(Mar 26 2020 at 14:42)</a>:</h4>
<p>apparently it doesn't repro locally though</p>



<a name="191894040"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894040" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894040">(Mar 26 2020 at 14:42)</a>:</h4>
<p>anyway I think we can let discussion continue there as it currently is</p>



<a name="191894045"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894045" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894045">(Mar 26 2020 at 14:42)</a>:</h4>
<p>I did fix a similar-feeling issue</p>



<a name="191894115"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894115" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894115">(Mar 26 2020 at 14:43)</a>:</h4>
<p>okay, so, last (before WG checkins) is the nominated issues</p>



<a name="191894231"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894231" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894231">(Mar 26 2020 at 14:43)</a>:</h4>
<p>there are three on the agenda. (There's four according to github, but that's because one was nominated in the past few hours; we'll leave that one for next week's pre-triage)</p>



<a name="191894246"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894246" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894246">(Mar 26 2020 at 14:44)</a>:</h4>
<p>nom 1/3: “Compiler incorrectly assumes int will never be one” <a href="https://github.com/rust-lang/rust/issues/69841" title="https://github.com/rust-lang/rust/issues/69841">#69841</a></p>



<a name="191894338"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894338" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894338">(Mar 26 2020 at 14:44)</a>:</h4>
<p>Okay so this was discussed two weeks ago</p>



<a name="191894356"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894356" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894356">(Mar 26 2020 at 14:44)</a>:</h4>
<blockquote>
<p>Namely, we have these LLVM-specific work items:</p>
<ul>
<li>The comment thread above indicates that this is fixed upstream</li>
<li>Is there an attached bug for the fix?</li>
<li>can we backport a narrow fix?</li>
<li>and/or push the upgrade through to the newer version of LLVM?</li>
</ul>
</blockquote>



<a name="191894435"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894435" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894435">(Mar 26 2020 at 14:45)</a>:</h4>
<p>there has been feedback from <span class="user-mention" data-user-id="133224">@Nikita Popov</span> about how to respond</p>



<a name="191894582"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894582" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894582">(Mar 26 2020 at 14:46)</a>:</h4>
<p>basically "excerpt this random set of hunks" from a patch</p>



<a name="191894601"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894601" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894601">(Mar 26 2020 at 14:46)</a>:</h4>
<p>so I think all we need is for someone to take charge here. (I think <span class="user-mention" data-user-id="133224">@Nikita Popov</span> 's advice is that we should be able to doa  backport of a narrow fix)</p>



<a name="191894617"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894617" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894617">(Mar 26 2020 at 14:46)</a>:</h4>
<p>seems ok, if they have confidence that'll work :)</p>



<a name="191894688"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894688" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894688">(Mar 26 2020 at 14:47)</a>:</h4>
<p>would <span class="user-mention" data-user-id="133224">@Nikita Popov</span> want to write up the PR perhaps?</p>



<a name="191894692"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894692" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894692">(Mar 26 2020 at 14:47)</a>:</h4>
<p>note that this was injected quite some time ago</p>



<a name="191894779"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894779" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894779">(Mar 26 2020 at 14:47)</a>:</h4>
<p>which to me means we don't need to put super high priority on a fix. I.e., I think we'd  be happy with a fix suitable for riding the trains; it doesn't need to be tailored into something that is beta-backportable, in my opinion.</p>



<a name="191894856"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894856" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894856">(Mar 26 2020 at 14:48)</a>:</h4>
<p>(which means maybe we could mentor someone on it?)</p>



<a name="191894873"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894873" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894873">(Mar 26 2020 at 14:48)</a>:</h4>
<p>seems fine. I guess the other question is status of a more general LLVM upgrade</p>



<a name="191894889"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894889" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894889">(Mar 26 2020 at 14:48)</a>:</h4>
<p>Oh that is true</p>



<a name="191894911"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894911" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894911">(Mar 26 2020 at 14:48)</a>:</h4>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> where are we on the more general LLVM upgrade at this point?</p>



<a name="191894915"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894915" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894915">(Mar 26 2020 at 14:48)</a>:</h4>
<p>I believe prep work is being done for LLVM 10</p>



<a name="191894921"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894921" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894921">(Mar 26 2020 at 14:48)</a>:</h4>
<p>(If we did backport, I think the steps required are to excerpt the patch and apply to the rust-llvm repo and then bump our revision locally?)</p>



<a name="191894985"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894985" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894985">(Mar 26 2020 at 14:49)</a>:</h4>
<p>Okay given that there's no one chomping at the bit here to take this on</p>



<a name="191894994"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894994" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894994">(Mar 26 2020 at 14:49)</a>:</h4>
<p>I'm going to self-assign it as a mentor</p>



<a name="191894997"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191894997" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191894997">(Mar 26 2020 at 14:49)</a>:</h4>
<p><span class="user-mention silent" data-user-id="126931">centril</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191894915" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191894915">said</a>:</p>
<blockquote>
<p>I believe prep work is being done for LLVM 10</p>
</blockquote>
<p>Specifically, <a href="https://github.com/rust-lang/rust/pull/70163" title="https://github.com/rust-lang/rust/pull/70163">https://github.com/rust-lang/rust/pull/70163</a></p>



<a name="191895050"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895050" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895050">(Mar 26 2020 at 14:49)</a>:</h4>
<p>We're stalled on LLVM</p>



<a name="191895079"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895079" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895079">(Mar 26 2020 at 14:49)</a>:</h4>
<p>(sizeable perf regression, unknown causes)</p>



<a name="191895131"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895131" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895131">(Mar 26 2020 at 14:50)</a>:</h4>
<p>(or maybe just mark it as a E-mentor bug? the mentor's don't self-assign ... unless they're self-assigning to indicate that they need to write up mentorship instructions, maybe?)</p>



<a name="191895243"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895243" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895243">(Mar 26 2020 at 14:50)</a>:</h4>
<p>(maybe mentors <em>should</em> self-assign?)</p>



<a name="191895249"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895249" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895249">(Mar 26 2020 at 14:50)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> I would say write-up some instructions and let's tweet out or something</p>



<a name="191895268"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895268" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895268">(Mar 26 2020 at 14:50)</a>:</h4>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> yeah sounds great</p>



<a name="191895279"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895279" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895279">(Mar 26 2020 at 14:51)</a>:</h4>
<p>moving on</p>



<a name="191895284"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895284" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895284">(Mar 26 2020 at 14:51)</a>:</h4>
<p>I usually self assign only for the time to write up instructions</p>



<a name="191895317"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895317" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895317">(Mar 26 2020 at 14:51)</a>:</h4>
<p>nom: “Add <del>cryptographic</del> hash of source files in debug info” <a href="https://github.com/rust-lang/rust/issues/69718" title="https://github.com/rust-lang/rust/issues/69718">#69718</a></p>



<a name="191895355"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895355" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895355">(Mar 26 2020 at 14:51)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116122">simulacrum</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191895079" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191895079">said</a>:</p>
<blockquote>
<p>(sizeable perf regression, unknown causes)</p>
</blockquote>
<p>blargh... <span aria-label="frown" class="emoji emoji-1f641" role="img" title="frown">:frown:</span> -- That cranelift backend will come in handy <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="191895478"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895478" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895478">(Mar 26 2020 at 14:52)</a>:</h4>
<p>Ah, yes. So <a href="https://github.com/rust-lang/rust/issues/69718" title="https://github.com/rust-lang/rust/issues/69718">#69718</a> -- this is adding source files hash into debug info -- <a href="https://github.com/rust-lang/rust/pull/69718#issuecomment-603415793" title="https://github.com/rust-lang/rust/pull/69718#issuecomment-603415793">you can find my summary comment here</a></p>



<a name="191895582"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895582" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895582">(Mar 26 2020 at 14:52)</a>:</h4>
<p>I wanted to raise this and "give notice" about the intent to land, following the (not yet fully formalized) MCP procedure</p>



<a name="191895605"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895605" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895605">(Mar 26 2020 at 14:53)</a>:</h4>
<p>what are the risks here?</p>



<a name="191895630"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895630" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895630">(Mar 26 2020 at 14:53)</a>:</h4>
<p>oh okay, its "just" a major change proposal?</p>



<a name="191895634"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895634" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895634">(Mar 26 2020 at 14:53)</a>:</h4>
<p>I don't really think there are risks</p>



<a name="191895643"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895643" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895643">(Mar 26 2020 at 14:53)</a>:</h4>
<p>sounds great</p>



<a name="191895652"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895652" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895652">(Mar 26 2020 at 14:53)</a>:</h4>
<p>But it's true that we'd probably want to continue doing this</p>



<a name="191895671"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895671" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895671">(Mar 26 2020 at 14:53)</a>:</h4>
<p>Though we don't really "guarantee" much about the status of our debuginfo per se</p>



<a name="191895701"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895701" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895701">(Mar 26 2020 at 14:53)</a>:</h4>
<p>continuing doing which?</p>



<a name="191895703"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895703" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895703">(Mar 26 2020 at 14:53)</a>:</h4>
<p>That said, other compiles do it, and I don't know that there's a reason <em>not to</em> include it</p>



<a name="191895723"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895723" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895723">(Mar 26 2020 at 14:53)</a>:</h4>
<p>Continue including hashes of source files in debuginfo</p>



<a name="191895786"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895786" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895786">(Mar 26 2020 at 14:54)</a>:</h4>
<p>as in, follow through on this PR?</p>



<a name="191895820"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895820" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895820">(Mar 26 2020 at 14:54)</a>:</h4>
<p>"continue" implies that we were doing it, which, I infer, we were not?</p>



<a name="191895833"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895833" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895833">(Mar 26 2020 at 14:54)</a>:</h4>
<p>Right, like if we reverted it, we might disrupt people's workflows</p>



<a name="191895853"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895853" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895853">(Mar 26 2020 at 14:54)</a>:</h4>
<p>We do not currently include file hash information</p>



<a name="191895868"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895868" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895868">(Mar 26 2020 at 14:54)</a>:</h4>
<p>Okay, I understand, i think.</p>



<a name="191895908"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895908" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895908">(Mar 26 2020 at 14:55)</a>:</h4>
<p>/me prefers "Commit to doing this" phrasing</p>



<a name="191895917"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895917" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895917">(Mar 26 2020 at 14:55)</a>:</h4>
<p>But I don't know why we would <em>want</em> to stop including hashes</p>



<a name="191895928"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895928" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895928">(Mar 26 2020 at 14:55)</a>:</h4>
<p>okay next up</p>



<a name="191895959"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191895959" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191895959">(Mar 26 2020 at 14:55)</a>:</h4>
<p>nom: “Box&lt;dyn FnOnce&gt; doesn’t respect self alignment” <a href="https://github.com/rust-lang/rust/issues/68304" title="https://github.com/rust-lang/rust/issues/68304">#68304</a></p>



<a name="191896113"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896113" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896113">(Mar 26 2020 at 14:56)</a>:</h4>
<p><span class="user-mention" data-user-id="119009">@eddyb</span> has written a <a href="https://github.com/rust-lang/rust/issues/68304#issuecomment-604064598" title="https://github.com/rust-lang/rust/issues/68304#issuecomment-604064598">summary of their proposal</a></p>



<a name="191896182"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896182" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> bjorn3 <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896182">(Mar 26 2020 at 14:56)</a>:</h4>
<p>It would be really useful for cg_clif to implement that proposal</p>



<a name="191896195"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896195" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896195">(Mar 26 2020 at 14:56)</a>:</h4>
<blockquote>
<p>We can also make this pattern be gated by a separate feature-gate (rather than unsized_locals), and make sure the standard library only uses that feature-gate and not unsized_locals.</p>
</blockquote>
<p><span aria-label="+1" class="emoji emoji-1f44d" role="img" title="+1">:+1:</span> -- I like the caution here.</p>



<a name="191896313"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896313" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896313">(Mar 26 2020 at 14:57)</a>:</h4>
<p>I think we can let follow-up discussion on <a href="https://github.com/rust-lang/rust/issues/68304" title="https://github.com/rust-lang/rust/issues/68304">#68304</a> move forward on either a Zulip topic, or on the issue itself</p>



<a name="191896329"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896329" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896329">(Mar 26 2020 at 14:57)</a>:</h4>
<p>Lets hear from <span class="user-group-mention" data-user-group-id="1380">@WG-learning</span> ?</p>



<a name="191896337"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896337" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> bjorn3 <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896337">(Mar 26 2020 at 14:57)</a>:</h4>
<p><span class="user-mention silent" data-user-id="133247">bjorn3</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191896182" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818/near/191896182">said</a>:</p>
<blockquote>
<p>It would be really useful for cg_clif to implement that proposal</p>
</blockquote>
<p>That would make me able to remove <a href="https://github.com/bjorn3/rustc_codegen_cranelift/blob/b113e88ddb399f92f0d044caa35e668d2499bdd9/src/base.rs#L67-L147" title="https://github.com/bjorn3/rustc_codegen_cranelift/blob/b113e88ddb399f92f0d044caa35e668d2499bdd9/src/base.rs#L67-L147">https://github.com/bjorn3/rustc_codegen_cranelift/blob/b113e88ddb399f92f0d044caa35e668d2499bdd9/src/base.rs#L67-L147</a></p>



<a name="191896369"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896369" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mark-i-m <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896369">(Mar 26 2020 at 14:57)</a>:</h4>
<p>Hi  (from WG learning)!</p>



<a name="191896423"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896423" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mark-i-m <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896423">(Mar 26 2020 at 14:58)</a>:</h4>
<ul>
<li>
<p>Previously, we decided to add an "Overview" chapter to the rustc-dev-guide. The idea is that people expressed that it was hard to see how everything fits together. We now have a draft of Overview chapter, include a high-level walkthrough of what the compiler does to your code. We are planning to post to Inside Rust to solicit feedback.<br>
    - Draft PR: <a href="https://github.com/rust-lang/rustc-dev-guide/pull/633" title="https://github.com/rust-lang/rustc-dev-guide/pull/633">https://github.com/rust-lang/rustc-dev-guide/pull/633</a><br>
    - Blog post to solicit feedback: <a href="https://github.com/rust-lang/blog.rust-lang.org/pull/551" title="https://github.com/rust-lang/blog.rust-lang.org/pull/551">https://github.com/rust-lang/blog.rust-lang.org/pull/551</a></p>
</li>
<li>
<p>Went through nagisa's notes on backend and transcribed into a chapter about the compiler backend: <a href="https://rustc-dev-guide.rust-lang.org/backend/backend.html" title="https://rustc-dev-guide.rust-lang.org/backend/backend.html">https://rustc-dev-guide.rust-lang.org/backend/backend.html</a><br>
    - Still needs filling out a bit more (nagisa intended it to be a bit of survey)</p>
</li>
<li>
<p>Renamed rustc-guide to rustc-dev-guide<br>
    - Blog post: <a href="https://blog.rust-lang.org/inside-rust/2020/03/13/rename-rustc-guide.html" title="https://blog.rust-lang.org/inside-rust/2020/03/13/rename-rustc-guide.html">https://blog.rust-lang.org/inside-rust/2020/03/13/rename-rustc-guide.html</a></p>
</li>
</ul>
<p>Next steps:</p>
<ul>
<li>Continue work on Overview chapter.</li>
<li>We decided to collect a document with holes in the current backend chapters (there are a lot) and fill them in incrementally, since it seems none of the backend experts are available for a lecture/extended discussion:  <a href="https://hackmd.io/fTJHEkb5TXuKh2ClBL_c_w" title="https://hackmd.io/fTJHEkb5TXuKh2ClBL_c_w">https://hackmd.io/fTJHEkb5TXuKh2ClBL_c_w</a></li>
<li>We want to do a cookbook-style appendix for PRs that help understanding some parts of the compiler. If you come across or write such a PR, please leave a link here: <a href="https://github.com/rust-lang/rustc-dev-guide/issues/619" title="https://github.com/rust-lang/rustc-dev-guide/issues/619">https://github.com/rust-lang/rustc-dev-guide/issues/619</a></li>
<li>We are leaning towards renaming the WG to better reflect purpose.</li>
<li>Ther is a possibility of filling out the parser chapter better with the help of Centril (pending their availability).</li>
<li>Will try to improve the organization of the guide by reordering chapters, and improving the "flow" between chapters, perhaps with some sort of recap sections at the top of each chapter.</li>
</ul>



<a name="191896603"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896603" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mark-i-m <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896603">(Mar 26 2020 at 14:59)</a>:</h4>
<p>Generally, I think it has been a productive time for us :)</p>



<a name="191896659"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896659" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896659">(Mar 26 2020 at 14:59)</a>:</h4>
<p>Great</p>



<a name="191896674"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896674" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896674">(Mar 26 2020 at 14:59)</a>:</h4>
<p><span aria-label="+1" class="emoji emoji-1f44d" role="img" title="+1">:+1:</span> to renaming -- I think some of our existing working groups (<em>cough</em> <a class="stream" data-stream-id="144729" href="/#narrow/stream/144729-wg-traits">#wg-traits</a> <em>cough</em>) have somewhat overly broad names, and that tailoring names will help clarify goals</p>



<a name="191896722"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896722" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896722">(Mar 26 2020 at 14:59)</a>:</h4>
<p>Also, this is awesome work</p>



<a name="191896739"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896739" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896739">(Mar 26 2020 at 15:00)</a>:</h4>
<p>I am going to assume that there is nothing to report from <span class="user-group-mention" data-user-group-id="1176">@WG-llvm</span> . (It should probably be recast as something other than a WG, but that's a discussion for another day)</p>



<a name="191896838"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896838" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896838">(Mar 26 2020 at 15:00)</a>:</h4>
<p>also, I need to sign off for another meeting</p>



<a name="191896944"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191896944" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191896944">(Mar 26 2020 at 15:00)</a>:</h4>
<p>so, thanks once again to everyone in <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> for attending! you all are awesome! Stay healthy! stay figuratively close and literally far far away!</p>



<a name="191897020"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191897020" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191897020">(Mar 26 2020 at 15:01)</a>:</h4>
<p>I have to sign off too but I want to post one final announcement I forgot:</p>
<ul>
<li>I am planning to go forward with the "major change" proposed by <span class="user-mention" data-user-id="124287">@mw</span> in  Make incr. comp. respect the -Ccodegen-units setting <a href="https://github.com/rust-lang/compiler-team/issues/245" title="https://github.com/rust-lang/compiler-team/issues/245">compiler-team#245</a> (presuming no contrary feedback received)</li>
</ul>



<a name="191897179"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191897179" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191897179">(Mar 26 2020 at 15:02)</a>:</h4>
<p>(also, <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> and I started work on <a href="https://hackmd.io/VhVSTwgiTcmEslbpC7qCOQ" title="https://hackmd.io/VhVSTwgiTcmEslbpC7qCOQ">an RFC formalizing the "major change" process</a>, if you're confused, the key point of it is that you write-up a change, find someone to "second" it, and we have a lightweight "give notice" period and then go ahead and do it)</p>



<a name="191897197"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191897197" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191897197">(Mar 26 2020 at 15:02)</a>:</h4>
<p>(but I'm trying to unblock some of the stuff that was opened in the meantime:)</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-03-26%20%2354818/near/191897566" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Nikita Popov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-03-26.20.2354818.html#191897566">(Mar 26 2020 at 15:05)</a>:</h4>
<p>Yeah, WG-llvm not doing much :) LLVM 10 upgrade is stuck on compile-time performance issues. I would appreciate it if a second pair of eyes could grab some CI artifacts from <a href="https://github.com/rust-lang/rust/pull/67759" title="https://github.com/rust-lang/rust/pull/67759">https://github.com/rust-lang/rust/pull/67759</a> and check if they see something I don't. I've also set up <a href="http://llvm-compile-time-tracker.com/graphs.php" title="http://llvm-compile-time-tracker.com/graphs.php">http://llvm-compile-time-tracker.com/graphs.php</a> to avoid more compile-time regressions in LLVM in the future, will see how that goes.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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